The EMC VisualSAN 4.0 pre-installation utility is provided for Dell customers who want to upgrade their V3.x installations of EMC VisualSAN to EMC VisualSAN V4.0. This utility must be run before starting the EMC VisualSAN 4.0 Setup program that performs the application upgrade. This step ensures that the existing EMC VisualSAN database can be properly modified during the upgrade.